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Séminaire Lotharingien de Combinatoire, B73e (2016), 54 pp.

# Dominique Foata and Guo-Niu Han

# André Permutation Calculus: a Twin Seidel Matrix Sequence

**Abstract.**
Entringer numbers occur in the André permutation combinatorial
set-up under several forms.
This leads to the construction of a matrix
refinement of the tangent (respectively secant) numbers. Furthermore,
closed expressions for the
three-variate exponential generating functions for pairs of so-called
Entringerian statistics are derived.

Received: January 15, 2016.
Accepted: February 11, 2016.

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